Island



UNITED STATES :PATENT OFFICE.

SAMUEL DARIJING, OF PROVIDENCE, RHODE ISLAND.

SCREW-TH READ GAGE.

SPECIFICATION-forming part of Letters Patent N o. 552,238, dated December 31, 1895.

Application filed September 5, 1895. Serial No. 561,477. (No model.)

To all whom t may concern:

Be it known that I, SAMUEL DARLING, a citizen of the United States, residing at Providencefin the State of Rhode Island, have invented a new and useful Improvement in Screw-Thread Gages, of which the following is a specification.

My invention consists in providing an intermediate stop for oppositely-arranged series of gage-plates, which are held upon a single pivot, in improved means for conveniently opening the said plates from` the handle, and in improved means for determining the variety of gages in the handle and the exact location of the gage-plate in the series when the Said gage-plates are closed into the handle, with the indicating-figures upon the gageplates concealed from view.

In the accompanying drawings, Figure l represents a side view of a screw-thread gage embodying my invention, showing a number of the gage-plates opened from thehandle. Fig. 2 represents an edge view of the same. Fig. 3 represents a side view with a single gage-plate opened from the handle for use. Fig. 4 represents a side view of a single gageplate removed from the handle. Figs. 5 and (5 are side views showing a modification and an improved system of numbering.

In the drawings, A- represents the handle, composed of two flat metallic strips a d, held at a suitable distance apart by means of the connecting-studs b b', riveted over the outer side of the strips composing the handle. The screw-thread gages CZ d are cut at the opposite ends of the gage-plates@ C, the gages d being cut in a longitudinal direction upon the edge of the gage-plate and adapted for use as a gage for internal screw-threads, while the gages d', which are made with a pitch corresponding to the pitch of the thread-gage at the opposite end, are cut transversely of the gageplate at the opposite end and adapted for use as a gage for external screw-threads, the said gage-plates being arranged in opposite series upon a single pivot-stud Z9, so as to fold into the handle upon opposite sides of the stopstud b, the gage-plates of one series being arranged alternately with the gage-plates of the opposite series, whereby a space c will be left between the narrow portions of the gageplates, which greatly facilitates the selection 'are arranged upon the pivot.

the end of the handle A to furnish a ready means for opening the same from the handle.

Each of the gage-plates is marked in the usual manner with the pitch or number of threads to an inch in the gage, and these numbers are repeated upon the handle in the same order in which the gage-plates of the series The user can determine at a glance by the order of the numbers upon the handle the deiinite location in the series of the gage-plates required.

A modiiication is shown in Figs. 5 and 6, in which the gages are cut obliquely at one end only of the gage-plates and arranged in opposite series upon a single pivot-stud b, so as to fold into the handle upon opposite sides of the stop-stud b', and upon the handle at either side of the central row of figures, which serve to indicate the relative position in the series of the gage required, are placed smaller figures indicating other pitches of screw-threads, for the measurement of which the thread-gage indicated by the larger stamped numbers are applicable. Thus referring to Fig. 5, the gage marked l() may also be used for gaging screwthreads of five and of twenty pitch. Therefore with this system of numbering a smaller number of gages may be employed in the handle to gage threads of the various pitches required.

' I claim asmy invention- 1. The combination of the handle provided with the stop for the inner edges of the gage plates, with the screw thread gage plates arranged upon opposite sides of the stop, and connected to the handle by means of a single pivot, substantially as described.

2. The combination of the handle provided with the stop for the inner edges of the gage plates, with the screw thread gage-plates arranged upon opposite sides of the stop, and connected to the handle by means of a single pivot, the said gage-plates being provided atV their ends with a projection, whereby the gageplates may be readilyT opened from their closed position in the handle, substantially as described.

3. The Combination of the handle, with the screw-thread gage-plates held upon a single pivot, the said gage-plates being provided at one end with a thread gage extending longitudinally of the plate, and at the opposite end With a corresponding thread gage extending transversely of the plate, the said gage plates when in use extending frein the opposite sides of the handle substantially as deseribed.

4. In a screw-thread gage, a series of gageplates arranged upon apivot, and provided at one of their sides with numbers which indicate the number of teeth to the inch in the gages eut on the plates, in combination with the saine numbers, arranged on a single plate, in the saine order that the correspondingly numbered gage-plates are arranged on the pivot.

5. In a serew-tl1read gage, a series of gage plates arranged upon a pivot, and provided at one of their sides with numbers which indin eate the number of teeth to the ineh in the v gages eut on the plates, in Combination with the saine numbers arranged on a single plate, and having in eonneetion therewith certain numbers which serve to indica-te other pitehes of screw threads to which each speeiie gage- 

